Back cover for a telephone handset



FIG. 1 is a top, rear and left side perspective view showing my new design;

FIG. 2 is a bottom, front and right side perspective view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a rear elevational view thereof;

FIG. 7 is a right side view thereof; and,

FIG. 8 is a top plan view. 

The ornamental design for a "back cover for a telephone handset", as shown and described. 